The Day in Pop Digest for 4/21/11: (NME) Police are investigating two death threats made to 13 year-old internet sensation Rebecca Black. According to Reuters, police in Anaheim, California are investigating two death threats that were made sometime during March, after the singer's track 'Friday' became a massive hit on YouTube. more

(Billboard) Teen singer/actress Demi Lovato has admitted that she has been struggling bipolar disorder along with anorexia, bulimia and cutting. "I never found out until I went into treatment that I was bipolar," says Lovato more

(Billboard) Elton John and "Glee's" Matthew Morrison have released their duet, which is a mash-up of John's "Mona Lisas And Mad Hatters" and "Rocket Man," which appeared on his classic 1972 album "Honky Chateau." more

(Jam!) Lady Gaga broke down in tears as she spoke out for the first time to angrily deny claims she ripped off Madonna's iconic song 'Express Yourself' for her track 'Born This Way'. more

(Billboard) "SNL" all-star host Justin Timberlake will return to host Saturday Night Live's season finale. The stint will be the pop star/actor's fourth time as the "SNL" host more

(AP) The new incarnation of Death Row Records does not have the rights to sell Dr. Dre's iconic rap album 'The Chronic' digitally, a federal judge ruled Tuesday. more

(FMQB) Lil Wayne has been filming select dates on his I Am Still Music tour and he will compile the footage into a tour documentary similar to Jay-Z's 2000 film, Backstage, and Russell Simmons' 1995 movie The Show. more

(Jam!) Justin Bieber's April 14 concert at Hayarkon Park in Tel Aviv drew somewhere between 17,000 (according police) and 24,000 fans (according to the promoters) — well below forecasts in the 35,000 range, but the pop star still made $1 million for his 90-minute show, sources said. more

(FMQB) Rihanna's "S&M" hits #1 on the Billboard Hot 100 chart, giving the Pop star her tenth #1 hit single. Rihanna also makes history as the youngest artist to rack up ten #1 hits at just over 23 years old. more

(Billboard) Glee's latest spin-off album, "Glee Presents the Warblers," is aiming to debut near the top of the Billboard 200 chart next week. more

(FMQB) Spider-Man: Turn Off The Dark will return to Broadway on June 14 The revamped show is expected to include new songs written by Bono & The Edge more

(Jam!) Rapper The Game has been detained in Canada after he was mysteriously denied entry into the country. more